This article explores and establishes comprehensive evaluation index system of wind power accommodation ability considering microscopic index and macroscopic index, and the index system includes conventional evaluation indexes such as forecast deviation, simultaneity factor and anti-peak rate, also newly introduced evaluation indexes such as installed capacity, power adequacy and accommodation space. Bayesian weight modified method is used for solving index weights of 8 wind power accommodation indexes. The paper puts forward a comprehensive evaluation model of wind power accommodation ability based on improved radar chart method, and this model changes traditional radar chart fan-shaped sector to quadrilateral evaluation region, and increasing angle bisector can solve the problem that evaluation results are not unique. It constructs new area and perimeter vectors of radar chart, which make the evaluation results give consideration to level of aggregation and balance degree of evaluation objectives, and case study results show that this model has a certain practical value.
Alongside the story of today’s commercially successful, propeller-type, horizontal axis wind turbine (HAWT), there is the lesser known story of the vertical axis wind turbine (VAWT). Once seen as a ...
Mineralization is an attractive concept for carbon capture and storage as it can avoid some of the potential public acceptance problems of geosequestering pressurised CO{sub 2}. But there are major cost and energy penalty concerns. A new integrated approach to mineralisation, avoiding the intermediate step of CO{sub 2} extraction and promising considerable benefits, is outlined here. The ICS process integrates two operation in the first, an ammonia-rich aqueous solution of ammonium bicarbonate is used to scrub carbon dioxide from flue gases to form a solution enriched in carbon dioxide. In the second, pretreated serpentinite or other suitable ultramafic rock is blended directly into this rich solution prior to the mixture being held under controlled conditions in a purpose-built reactor. The silicate minerals react with ammonium carbonate to form magnesium carbonate and silica, thereby directly removing frrm solution the carbon dioxide that was absorbed in the flue gas scrubbers as insoluble precipitates. The capture solution is regenerated for its recycle to the flue gas scrubbers. Trials at Lucas Hights have demonstrated the direct conversion of silicates to magnesite, and work continues to establish optimum conditions for this reaction to allow a continuous pilot plant to be designed. Their thermodynamic modeling has confirmed the energy efficiency of the process. Pre-feasibility studies into retrofitting ICS to major existing coal-fired power stations to capture at least 90% of their carbon dioxide emissions suggest a total cost of US$50 to capture and store each tonne of the gas permanently. Since the tonnage of rock required for this mineralisation process is six times the tonnage of coal to be fired in the host power station logic dictates that any new power station should be nearer the rock deposit than the coal field that furnishes its fuel. 2 figs.
It looks likely that gas fired combined cycle plants will need to be retrofitted with carbon capture systems in the future, and need to be demonstrating capture readiness now, certainly in the UK. What are the options for raising the steam that is likely to be needed to regenerate the solvent in a post combustion system?
